Charging apparatus for centrifugal casting-machines



1. ILL/Inn. CHARGING APPARATUS FOR CENTRIFUGAL CASTING MACHINES.

APPLICATION FILED NOVI. l9lB.

Patented J une' 24, 1919.

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UNITED STATES lrATimT OFFICE.

JAMES B. LAD-D, or filtrazione-PENNSYLVANIA, Assren'oa To UNITED STATESCAST.1

IRON PIPE a TOUNDRY GOMPANY,.OF BURLINGTomNEW JERSEY, A CORPORATION OFNEW JERSEY.

CHA-neme APPARATUS Fon. OETRIFUGAL OASTINGLMAOHI'NES.

specification of Letfersratenf.' patented June 24,11919 ApplicationledNovember 1, 1918.- Serial o. 260,659.

Centrifugal Casting-Machines, of which the following is a true and exactdescription, reference being had to the accompanying drawing, whichforms a part thereof.

My present invention relates to centrifugal casting machines andparticularly to machines for casting relatively large cast iron pipes.The object of my invention is to provide improved means for supplyingVthe molten casting forming metal to the rotating `mold of the castingmachine.

The various features of novelty which characterize my invention arepointed out with particularity in the claims annexed to andforming aportion of this specification. For a better understanding of the invention, however, and the advantages possessed by it reference should behad tothe accompanying drawings and descri tive'. dej scribed apreferred embodiment of my inmatter in which I have illustrated anvention.

Of the drawings:

Figure 1 is an elevation, partly in section, of the mold of acentrifugal casting machine and the apparatus for charging the same.

Fig. 2 is a transverse section on the line 2-2 of Fig. 1.

Fig. 3 is a View taken similarly to Fig.

2 showing parts in different relative posi tions, and

Fig. 4 is a section -on the line Fig. 1, and

Fig. 5 is a section on the line 5-5 of Fig. 1.

In the drawings, A represents the revolving mold of the casting machine.The mold A is shown as a tubular body of metal provided at its oppositelends with circumfer-- ential surfaces A and A2, engaged by themechanism, not shown, for supporting and rotating the mold during thecasting operation. The mold shown is intended for cast- 1n a th mo d atwhich the bell end of the pipe is formed is closed by an end member Bwhich is detachably secured in the mold body A in B. LADO, a

sa of ipe with a bell end and the end of-y any convenient way, as shownit has arearwardly extending ila-nge B4 which fits overl acircularflange J of an end pieceJ in which is also, formed a bearing J2'fora trunnion D at the end of the lling trough. The end member -B isprovided with a .hol-f low boss B extending into ,the moldcavitysurrounded by av dried sand core collar C, `which forms the innersurface of a short length of the pipe at the bell end. The innersurface, Bzf'of the boss B is conical with its largest diameter -at itsinner end. The .end member' Bis provided with an axial socket J2 toreceive a trunnion D formed at the inner endof the'mold chargingtrough.

The spigot end ofthe mold body A is'closed against the escapeA of moltenmetal by an f annular `member 'b ,fitting within they mold body A andadjustably secured therein as by means of the set screws 7). Theposition at which the member b is secured-in place depends upon thelength of the' pipe 'P which itis desiredfto cast.

The charging trough Dis tubular and is' formed with ya discharge slot D2extending alongithe portion o1 the length of the trough received in themold cavity in-the1mold charging Operation. troughD Vis'formed with alateral tubular extension D3 formin lthe trough filling inlet.

The charging troug D. is formed of metal and is provided with arefractory liningE.

` The trough D is manipulated by means of a bar or operating rod FrigiDdly secured to the outer end of the trough The trough is supportedon a groovedl roller G-mounted in a stationary/pedestal G adjacentthe'mold, and the bar F passes through a guide sleeve .Hf formed in astationary pedestal H, which is more remote from the mold than -thepedestal G. 'The bar F .is in the form of a'rod circular in crosssection (see Fig. 4) except AtV its outer end thel that at one Side itis flattened and provided I with gear teeth F', so that the bar. F isessen'- tially a' rack bar. The portion of the outer end of the bar F,received in the 4sleeve H',

When the trough 'is in' thel mold charging position Shown in Fig. 1, isprovided With circular ribs F2 separated by clrcumferential withdrawnfrom the mold and -returned to the latter end of one charging operationand preparatory to a subsequent charging operation. With the troughinserted in the mold, as shown in Fig. 1, its molten metal contents maybe discharged into the mold by rotatlng the bar F and thereby the troughD. For this purpose a hand wheel F3 is provided at the outer end of thebar F. When the trough'is thus being rotated its axial displacement isprevented by the ear I in meshwith the circular ribs F2. o preventmolten metal from spilling out of the trough through the inlet openingD8, when :the

trough is turned from the position shown in Figs. 1 and 2 to theposition shown in Fig. 3, the tubular inlet D3 is extended radiallyoutward from the periphery of the body of the trough, and is so' set andangularly disposed that when the trough is in the trough fillingposition with the discharge slot D2 at the top of the trough, as shownin Figs. 1 and 2, the lateral projection D3 is inclined away roln oneside of the yertical plane through the trough axis at an 'angle of aboutand when the trough is turned into the dischar e position shown in Fig.3, the projection 3 is inclined to the opposite side of that verticalplane at an angle of about 45C.

To provide the necessary metal at the bell end of the pipe to fill theportion of the mold surrounding the core C I have extended the trough Dinto the hollow boss B', so that a portion of the metal poured out of,the trough'willfall directly on the conical inner surface Bz ofthe bossB. The metal falling against this surface B2 is carried by centrifugalaction to the inner end of the surface,

and thence flows into the portion of the mold cavity for which it isintended.

The mold charging apparatus disclosed is simple in construction andreliable in operation, and because of the manner in which it is'formedand its relatively small bulk is comparatively easy to manipulate. Whilein accordance with the provisions of the stat utes I have illustratedand described the best form of my linvention now known to me, it will beapparent to those skilled. in the art that changes may be made in theform of the apparatus disclosed without departing from the spirit of myinvention as set forth in the appended claims, and that some features ofmy invention may sometimes be used to advantage without a correspondinguse 'of other features.

Having now described my invention, what Iv claim as new and desire tosecure by Letters Patent, is:

. l. In centrifugal casting apparatus, the combination with a rotatablemold, of a lcharging trough and means for moving .it

axially of the mold .into and out of the latter comprising a stationarysupport adjacent the mold and a roller journaled thereon on which thetrough rests, and a second stationary support more remote from the mold,and cooperating gear members carried by .the trough and said secondsupport for moving said trough axially of the mold.

2. Incentrifugal casting apparatus, the combination with a rotatablemold, of a mold charging trough and means for supporting said troughcomprising a pair of stationary supports one adjacent and the other moreremote from the mold, of a roller journaled in the support adjacent themold on which the trough rests, a rack bar secured to the trough andhaving a sliding bearing in the more remote support and a spur gearjournaled in the more remote support and in mesh with said rack bar.

3. In centrifugal casting apparatus, the combination with a rotatablemold, of a rotatable charging trough axially movable into and out ofthe'mold, and means for supporting and moving said trough comprising apair of stationary supports located one adjacent to, and one more remotefrom the end of the mold, a roller journaled in the first mentionedsupport on which the trough rests, the second of said supports beingprovidedv with a sleeve, a rack bar secured to one end of the trough andsliding in said sleeve, a spur gear journaled in second support and inmesh with said rack bar, said rack bar having a cylindrical ortionprovided with circumferential ribs a apted to 'mesh with the spur gearwhen'the trough is in the mold charging position, and means for rotatingsaid trough and rack bar when the trough is in the mold chargingposition.

4. In a centrifugal pipe casting machine the combination with arotatable mold enlarged at one end to form a bell end pipe and providedwith an end member at its enlarged end having a tubular portionextendinginto the mold cavity and formed with a conical inner surface the base ofwhich is at the inner end of said mold, and mold charging means adaptedto supply molten metal along Ithe length of the mold and a ainst saidconical surface.

' 5. n a centrifugal pipe casting machine, the combination with arotatable mold enlarged at one end to form a bell end pipe and providedwith an end member at its ena tubular portion extendlarged end having lcavity and formed with a ing into the mo 4conical inner surface the baseof which, is at

